Su Wanhe, who left her job and returned home, pushed open the dusty door of the Su family's old house. In her father Su Mu's old lesson plans and Chen Jingya's oil paint box, she came across secrets that had been covered up for fifteen years - the blue silk thread stuck in the eighth notch of the pointer, the jealousy diary hidden deep in the attic, and the past events "kindly" revealed by the school worker Liu Mei, all pointing to the unknown side of "mother" Chen Jingyi.
In order to find out the truth about the "accident" between Su Mu and Chen Jingya, she followed the clues of old objects: she took out the key evidence in the pointer from the old carpenter's shop, found the forged resignation application in the archives of Linjiang Middle School, and reunited with the framed witness Lin Yu at the art gallery in the neighboring city. In the process, Chen Jingyi's obstruction, Zhao Jingshen's cover-up, and Liu Mei's "self-defeating efforts" made the crisis closer; and Li Xue's note, Zhou Yang's testimony, and the old principal's original materials made justice gradually clear.
When the verdict was announced in court, Su Wanhe, who had been wronged, did not stop at revenge. She transformed the old house into the "Sunflower Youth Art Charity Space", used Su Mu's lesson plans to convey goodwill, used Chen Jingya's paintings to sow warmth, and let Lin Yu's sunflower spirit nourish childlike innocence. From the promise at the seaside to the inheritance of scholarships, from the children's paintbrushes to the warmth of the small town, fifteen years of hatred finally turned into protection. All the hidden beauty and original intentions bloomed with eternal light in the sun-born time.
